4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief UDPPacket non-inline non-template implementation */
26 #include "UDPPacket.hh"
27 //#include "UDPPacket.ih"
28 #include "IPv4Packet.hh"
32 #include <boost/io/ios_state.hpp>
33 #include "../../Packets/Packets.hh"
34 #include "../../Utils/IpChecksum.hh"
35 #include "IPv4Packet.hh"
36 #include "IPv6Packet.hh"
39 ///////////////////////////////cc.p////////////////////////////////////////
42 senf::PacketRegistry<senf::IpTypes>::RegistrationProxy<senf::UDPPacket>
43 registerUDPPacket (17);
46 ///////////////////////////////////////////////////////////////////////////
47 // senf::UDPPacketParser
49 prefix_ boost::uint16_t senf::UDPPacketParser::calcChecksum()
53 // first on to the awkward part: the IP pseudo header
54 IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
56 // Pseudo header defined in RFC768
57 summer.feed( ipv4->source().i(),
58 ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
59 ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
60 summer.feed( ipv4->destination().i(),
61 ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
63 ///\fixme May there be another header between the IPv4 header and UDP? if so, we
64 /// need to hack the correct protocol number here ...
66 summer.feed( i() + length_offset, i() + length_offset + 2 );
69 // Pseudo header defined in RFC2460
70 IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
72 summer.feed( ipv6->source().i(),
73 ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
74 ///\todo Implement routing header support
75 // The destination used here must be the *final* destination ...
76 summer.feed( ipv6->destination().i(),
77 ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
78 // This is a simplification. The value is really 32bit to support UDP Jumbograms
79 // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
80 summer.feed( i() + length_offset, i() + length_offset + 2 );
81 // RFC2460 specifies, that this must always be 17, not the value used in the ipv6
88 // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum
89 // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
90 summer.feed( i(), i()+checksum_offset );
91 summer.feed( i()+checksum_offset+2, data().end() );
93 boost::uint16_t rv (summer.sum());
94 return rv ? rv : 0xffffu;
97 ///////////////////////////////////////////////////////////////////////////
98 // senf::UDPPacketType
100 prefix_ void senf::UDPPacketType::dump(packet p, std::ostream & os)
102 boost::io::ios_all_saver ias(os);
104 << " source port : " << p->source() << "\n"
105 << " dest port : " << p->destination() << "\n"
106 << " length : " << p->length() << "\n"
108 << std::hex << std::setw(4) << std::setfill('0') << p->checksum() << "\n";
111 prefix_ void senf::UDPPacketType::finalize(packet p)
113 p->length() << p.size();
114 p->checksum() << p->calcChecksum();
117 ///////////////////////////////cc.e////////////////////////////////////////
124 // c-file-style: "senf"
125 // indent-tabs-mode: nil
126 // ispell-local-dictionary: "american"
127 // compile-command: "scons -u test"
128 // comment-column: 40